Getting to the mechanics of the watch, there are two remarkable systems at work, both visible through the dial. The first is a fusée and chain constant force mechanism (operating between 10:30 and 1:30 on the dial), which is meant to counteract the loss of amplitude associated with the watch’s unhiding mainspring. The 585-part fusée and chain transmission system keeps that force perfectly stable throughout the full reserve. Transmission between the barrel and the fusée is handled by an 18-cm-long chain. As the mainspring unwinds, the chain wraps itself around the barrel, drawing power to the fusée, regulating to the going gear train and eventually to the silicon escapement down the line. Being fully visible, winding the watch will yield a rare view of the chain winding itself back around the fusée.
Introducing The Zenith Academy Christophe Colomb Hurricane Grand Voyage II
